August weather forecast
Waukesha, WI

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Weather in August

As August arrives, summer continues its reign in Waukesha even though a slight dip in temperatures is noticeable. The climate remains warm, retaining much of July's tropical feel. The routine of rainfall, however, reduces in intensity. The advent of August brings the longest sunlight durations of the year, bathing the city in warm, radiant light. The summer breeze, light and refreshing, continues to prevail.

Temperature

August in Waukesha denotes a minimal variation in the average high-temperature to a still warm 76.8°F (24.9°C) from July's 78.1°F (25.6°C). Waukesha's nighttime temperature during August is consistently averaged at a refreshing 61.7°F (16.5°C).

Humidity

The average relative humidity in August in Waukesha, Wisconsin, is 80%.

Rainfall

In Waukesha, Wisconsin, in August, during 13.2 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In Waukesha, Wisconsin, during the entire year, the rain falls for 114.5 days and collects up to 12.2" (310mm) of precipitation.

Snowfall

May through September are months without snowfall in Waukesha, Wisconsin.

Daylight

The average length of the day in August in Waukesha is 13h and 53min.
On the first day of August in Waukesha, sunrise is at 5:44 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 7:28 pm CDT.

Sunshine

July and August, with an average of 10.2h of sunshine, are months with the most sunshine in Waukesha.

UV index

In August, the average daily maximum UV index in Waukesha is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: In August, the maximum UV index of 5 suggests these recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are August temperatures in Waukesha?

The average high-temperature, in August, in Waukesha, is 76.8°F (24.9°C), while the average low-temperature is 61.7°F (16.5°C).

What is the average humidity in August in Waukesha?

The average relative humidity in August is 80%.

How much does it rain in Waukesha in August?

In Waukesha, in August, during 13.2 rainfall days, 1.38" (35mm) of precipitation is typically accumulated.

When it does not snow in Waukesha?

May through September are months without snowfall in Waukesha.

What is the average length of the day in August in Waukesha?

In Waukesha, Wisconsin, the average day length in August is 13h and 53min.

When is the sunrise / sunset in August in Waukesha?

On the first day of August in Waukesha, Wisconsin, sunrise is at 5:44 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 7:28 pm CDT.

What is the month with the most sunshine in Waukesha?

July and August, with an average of 10.2h of sunshine, are months with the most sunshine.

How many hours of sunshine does Waukesha have in August?

In Waukesha, the average sunshine duration in August is 10.2h.

How high is the UV index in August in Waukesha?

In Waukesha, Wisconsin, the average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Waukesha, WI

Average temperature in August - Waukesha, WI
  • Average high temperature in August: 76.8°F

The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (25°F).

  • Average low temperature in August: 61.7°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (14°F).

Average pressure in August
Waukesha, WI

Average pressure in August - Waukesha, WI
  • Average pressure in August: 29.97"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in August
Waukesha, WI

Average wind speed in August - Waukesha, WI
  • Average wind speed in August: 6.7mph

The windiest months (with the highest average wind speed) are January and February (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).

Average humidity in August
Waukesha, WI

Average humidity in August - Waukesha, WI
  • Average humidity in August: 80%

The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April, October and November (77%).

Average rainfall in August
Waukesha, WI

Average rainfall in August - Waukesha, WI
  • Average rainfall in August: 1.38"

The wettest month (with the highest rainfall) is July (1.73").
The driest months (with the least rainfall) are February and December (0.51").

Average rainfall days in August
Waukesha, WI

Average rainfall days in August - Waukesha, WI
  • Average rainfall days in August: 13.2 days

The month with the highest number of rainy days is July (14.3 days).
The month with the least rainy days is February (3.6 days).

Average snowfall in August
Waukesha, WI

Average snowfall in August - Waukesha, WI
  • Average snowfall in August: 0"

The month with the highest snowfall is January (1.57").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in August
Waukesha, WI

Average snowfall days in August - Waukesha, WI
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (11.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in August /
Average sunshine in August
Waukesha, WI

Average daylight in August / Average sunshine in August - Waukesha, WI
  • Average daylight in August: 13h and 5min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in August: 10h and 1min

The months with the most sunshine are July and August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days in August
Waukesha, WI

Average sunshine days in August - Waukesha, WI
  • Average sunshine days in August: 13.9 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is July (13.3 days).

Average UV index in August
Waukesha, WI

Average UV index in August - Waukesha, WI
  • Average UV index in August: 5

The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in August
Waukesha, WI

Average cloud cover in August - Waukesha, WI
  • Average cloud cover in August: 29

The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in August
Waukesha, WI

Average visibility in August - Waukesha, WI
  • Average visibility in August: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Waukesha, Wisconsin, USA

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